Mathematica is described as «computational software program used widely in scientific, engineering, and mathematical fields and other areas of technical computing» and is a very popular app in the education & reference category. There are more than 50 alternatives to Mathematica for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Android. The best alternative is SageMath, which is both free and Open Source. Other great apps like Mathematica are GNU Octave, Jupyter, Maxima and R (programming language).Mathematica alternatives are mainly Calculators but may also be Programming Languages or Statistical Analyzers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Mathematica.